November 2017
Beginner to intermediate
344 pages
7h 2m
Chinese
Content preview from 深入理解運算原理｜從簡單的機器到無所不能的程式
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194
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第 6 章
現在我們可以將
#to_digits
轉譯成 proc：
TO_DIGITS =
Z[-> f { -> n { PUSH[
IF[IS_LESS_OR_EQUAL[n][DECREMENT[TEN]]][
EMPTY
][
-> x {
f[DIV[n][TEN]][x]
}
]
][MOD[n][TEN]] } }]
它能運作嗎？
>> to_array(TO_DIGITS[FIVE]).map { |p| to_integer(p) }
=> [5]
>> to_array(TO_DIGITS[POWER[FIVE][THREE]]).map { |p| to_integer(p) }
=> [1, 2, 5]
可以。而且因為我們將
1
表示
'1'
的字串編碼設計遠見，由
TO_DIGITS
產生的陣列已經
是有效的字串：
>> to_string(TO_DIGITS[FIVE])
=> "5"
>> to_string(TO_DIGITS[POWER[FIVE][THREE]])
=> "125"
所以我們可以用 FizzBuzz 裡的
TO_DIGITS
換掉
#to_s
：
MAP[RANGE[ONE][HUNDRED]][-> n {
IF[IS_ZERO[MOD[n][FIFTEEN]]][
FIZZBUZZ
][IF[IS_ZERO[MOD[n][THREE]]][
FIZZ
][IF[IS_ZERO[MOD[n][FIVE]]][
BUZZ
][
TO_DIGITS[n]
]]] ...
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